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Trader Robert Arciero works on the floor of the New York Stock Exchange Tuesday, March 12, 2013. Stocks are edging lower on Wall Street in early trading following a seven-day rally. (AP Photo/Richard Drew)

Trader Robert Arciero works on the floor of the New York Stock Exchange Tuesday, March 12, 2013. Stocks are edging lower on Wall Street in early trading following a seven-day rally. (AP Photo/Richard Drew)